Apart from the gambling patterns, they should also look for the devices and mac addresses. Usually people who share IP addresses don't share the devices and hence there need to be through checking before concluding anything.
I also agree with you but however, there is always a parliament or team of workers who are responsible for celyber security and security issues, I guess those in this office handle such related problems and then make decisions if they should take actions or not but if this accounts has no much significance to the casino automated machines do the job and if the user files an appeal then humans can look into the issue.
That's my guess.